The court heard one victim was persuaded to send Gibson money for business opportunities, hospital expenses and online trading.
She lost more than £5,600 and said she had suffered "anxiety and emotional distress".
Another, known as SC, handed over more than £30,000 when Gibson claimed he could make substantial returns through investments and trading.
She lost £21,000 after getting only about £9,700 back and said she had been left "heavily in debt".
Another, JH, invested on the back of Gibson's claims he was a successful businessman.
She gave him £28,000 and got £10,000 back and said it had affected her relationships with her children.
The fourth victim, a retired super yacht captain known as PH, invested £23,350 and said he had suffered "severe" emotional impact.
In text messages released after the case, Gibson claimed he had homes in Sandbanks, Bath, Dubai, Singapore and Mayfair in London, as well as 21 rental properties.
He wrote: "Mate I have everything I want, I have amazing houses, cars, boats, helicopters."
Gibson also said he had made £1.1m through financial trading, adding: "I am trading a five million account on my phone from a hospital bed."
In one exchange, he asked a victim about their preference for clothing and shoe brands.
After being asked the spending limit, Gibson replied: "In January I was valued at 440m if you need me."
Gibson's barrister had asked Judge Jaron Crooknorth to defer sentencing, saying it would give him time to earn money with which to repay the victims.
But the prosecution raised concerns over his finances and his credibility, saying there had been hundreds of thousands of pounds going through his accounts, but it had been spent on cars and overseas travel.
Crooknorth told Gibson his offending was "serious, sophisticated and sustained" and had involved deception from his "first contact" with his victims.
He said between July 2020 and October 2021, Gibson used false names, had invented business opportunities, and used fake bank statements to show apparent substantial wealth to persuade them to hand money over.
"Joseph Gibson, you are simply a fraudster," Crooknorth said.
"It has taken years for you to admit that.
"Pity those who have had the misfortune to have you come into their lives, prey on their affections, steal their money, steal their goals and fracture their relationships."
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